P-hydroxybenzoic Acid is white crystal powder without any smell but is astringent. P-hydroxybenzoic Acid is easily dissolved in hot water, alcohol, ether, acetone; slightly dissolved in cold water, benzene, and not dissolved in carbon bisulfide. It is dissolved in 125 cold water and relative density is 1.46.

Specification of P-Hydroxybenzoic Acid

Item

Specification

Polymer Grade

Technical Grade

Appearance

white crystal powder

white crystal powder

Purity(on dry base) %

99.6

99.0

Melting Point

214-217

212-216

Odor

odorless

odorless

Solubility

Clear and transparent

clear and transparent

Loss on Drying %

0.20

0.50

Color(Pt-Co)

10

40

Ash %

0.02

0.15

Sulfate(SO42-)

0.01

0.05

Chloride(Cl-) %

0.005

0.02

Phenol %

0.01

0.10

Salicylic Acid %

0.02

0.10

4-Hydroxyisophthalic Acid(HIPA) ppm

500

/

Insolubles in Methanol ppm

50

/

Potassium(K+) ppm

5

/

Sodium (Na+) ppm

5

/

Iron (Fe) ppm

5

/

Ca2++Mg2+ppm

5

/

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